I've had a similar problem. After uninstalling emerald (sudo apt-get remove emerald) everything is back to normal again. Seems like emerald and unity-window-decorator are not a good match. Not sure if the OP also has emerald installed, but for me this was the solution.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/771929 Title: Window Decoration disappears after clicking on the top left icon -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
